Why de hell my staff won't eat?

[StudioMax]

I got a perfect Staff Canteen, it is staff only, there are clean trays on the serving tables, there is staff food, there is a staff room next to it, but my staff will not eat. To fix the staff food need I placed down some snack machines, but I just want a working staff canteen. I have tried the following solutions

- remove the room and add it again
- remove serving tables and place them again
- make it all a staff room
- food distribution from another kitchen

But all of this won't work, any other solution?

 

[Enigmaticrose4]

This is a bug that has just popped up and was already reported here.

You can get around it at the moment by placing snack machines.